in·co·her·ent

[in-koh-heer-uhnt, -her-]
adjective
1.
without logical or meaningful connection; disjointed; rambling: an incoherent sentence.
2.
characterized by such thought or language, as a person: incoherent with rage.
3.
not coherent or cohering: an incoherent mixture.
4.
lacking physical cohesion; loose: incoherent dust.
5.
lacking unity or harmony of elements: an incoherent public.
6.
lacking congruity of parts; uncoordinated.
7.
different or incompatible by nature, as things.
8.
Physics. (of a wave) having a low degree of coherence. Compare coherent ( def 4 ).

Origin:
1620–30; in-3 + coherent

in·co·her·ent·ly, adverb


1. confused, irrational, muddled.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Incoherent is an LSAT word you need to know.
So is assertion. Does it mean:
a positive statement or declaration, often without support or reason:
having the property that its consistency or inconsistency with the axioms of a given logical system is determinable
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World English Dictionary
incoherent (ˌɪnkəʊˈhɪərənt) [Click for IPA pronunciation guide]
 
adj
1.  lacking in clarity or organization; disordered
2.  unable to express oneself clearly; inarticulate
3.  physics (of two or more waves) having the same frequency but not the same phase: incoherent light
 
inco'herence
 
n
 
inco'herency
 
n
 
inco'herentness
 
n
 
inco'herently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

incoherent
1620s, from in- (1) + coherent.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But otherwise your troll attempt was a weak, incoherent ramble lacking in both
  style and substance.
They look weak, angry, and are completely incoherent.
It's evident, cosmologists don't know, what to say about it and their claims
  are becoming confused and incoherent.
Before the therapy, these stroke patients responded to questions with largely
  incoherent sounds and phrases.
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